Daniel O'Brien

Daniel or Dan O'Brien may refer to:

• Daniel O'Brien, 1st Viscount Clare (1577–1663), MP for County Clare, younger son of Connor O'Brien, 3rd Earl of Thomond
• Daniel O'Brien, 3rd Viscount Clare (fl. 1670-1691), son of Connor O'Brien, 2nd Viscount Clare
• Daniel O'Brien, 4th Viscount Clare (died 1693), son of Daniel O'Brien, 3rd Viscount Clare
• Daniel O'Brien (comedian) (born 1986), American internet comedian and Senior Writer for Cracked
• Dan O'Brien (born 1966), American decathlete
• Dan O'Brien (author) (born 1947), American author and rancher
• Dan O'Brien (baseball coach) (born 1971), American college baseball coach
• Dan O'Brien (baseball executive), former general manager of Major League Baseball's Cincinnati Reds
• Dan O'Brien (footballer) (1884–1917), Australian rules football player
• Dan O'Brien (pitcher) (born 1954), American baseball player
• Dan O'Brien (playwright) (born 1974), American playwright
• Dan O'Brien (soccer) (born 1986), American soccer player
• Dan O'Brien (sports journalist), American sports journalist, author and screenwriter
• Dan O'Brien Sr. (1929–2017), former front office executive in Major League and minor league baseball
• Danny O'Brien (gridiron football) (born 1990), American college football quarterback
• Danny O'Brien (journalist) (born 1969), English technology journalist

See also

• Danny O'Brien (disambiguation)
• Danielle O'Brien (born 1990), Australian ice dancer